Malicious PDF — malware analysis report

Static analysis result for SHA-256 425e6c8659f566fa…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 06:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d56ace0f5ee2ea741ed34745d645b033 SHA-1: 675a889372500a578ed5d3c97388e4c996c94b5b SHA-256: 425e6c8659f566fa287084436e4dc5f99b797d55d4813535e5fe413ab374bcba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript (PDF_JS) suggests active content designed to execute malicious actions. Furthermore, the document contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=keymapper+android+no+root PDF link annotation
    • http://ge-mak.com/files/josubag.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kuligipokagigawo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d522544ab---8162160925.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/2416061777.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/zeburime.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bubosanoseboxawivoxejapak.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/46834456454.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/26166993806.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/36472692264.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/84831618973.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xetetepedob.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5902196d---12856854809.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/73698267334.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/peperef.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/bofupixubeninija.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/10575137224.pdfIn PDF document text
    • http://rubensova16.cz/files/file/tosuwov.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/turimufituwedawi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3e34f805199cb498e6e760cd4fbe9f1a/846430684.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/54302289059.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fuwepugewewimikezuxalu.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/pevazuvinujojamosozo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B5 17860 bytes
SHA-256: e9adda737a3063cccc47eedb9448ca9588c011511bfe39d089d67e8475a5b683
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 10444 bytes
SHA-256: 3a4ec0627d3fbed25d465e5afc1b151f4f1f725493130a0ed546f7918e53b26a
font_02_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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